Lake Diefenbaker Updates
Lake Diefenbaker Updates
Updated November 5, 2026
Current Conditions
- Flows in the Oldman River Basin are generally near median levels for this time of year.
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Flows in the Bow River and Red Deer River basins are generally between the median and lower quartile levels for this time of year.
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Inflows into Lake Diefenbaker are currently between the median and upper quartile for this time of year.
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Lake Diefenbaker water levels are currently between the median and lower quartile and remain within the historical interquartile range.
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Conditions will continue to be monitored closely, and outflows may be adjusted as required.
Forecast Overview
The table below shows the updated 10-day forecast for Lake Diefenbaker.
- Inflows into Lake Diefenbaker are expected to remain near 140 m³/s over the weekend before gradually declining to approximately 115 m³/s by the end of the forecast period.
- Daily mean outflows are expected to remain steady at approximately 130 m³/s throughout the forecast period.
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Lake Diefenbaker water levels are expected to decline slightly from 555.32 m to 555.30 m over the forecast period.
Notes:
- Flows shown in the table above are mean (average) daily flows. Actual releases from Lake Diefenbaker may fluctuate throughout the day as SaskPower adjusts operations at Coteau Creek Hydro Station to meet the Province’s electricity demands.
- Lake Diefenbaker levels appear lower than previously reported due to an instrument drift correction. Physical water levels have not dropped.
Hydrologic / Weather Conditions
- No significant precipitation was received across the South Saskatchewan River Basin this week.
- No significant precipitation is forecast across the basin over the weekend.
Below are the updated plots showing 2026 observed inflows and reservoir elevations compared to historical ranges.
An Experienced Team
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